Prospect of Big-Inch Sprial Hidden Arc Welded Tube's Application in Long-Distance Pipeline

The application,requirement and producing lines both in domestic and abroad,have been introduced in this paper.Through the analysis and comparision of all kinds of big_inch straight welded tube's and big_inch spiral welded tube's technology and economics features,according to our nation's situation,the author purposes that the big_inch spiral hidden welded tube's application in the long_distance transportion of oil and gas is available.To meet the need of welded tube in petroleum extraction and in the transporting gasoline,kerosene and diesel oil in petrochemical plant,it is urgent to set up a ERW assembly for the tube with the diameter above 508 mm.